State plane analysis of an auxiliary resonant commutated pole inverter and implementation with load current adaptive fixed timing control

State plane analysis has been successfully applied to resonant DC-DC converters. The equivalent circuit of the resonant mode of an auxiliary resonant commutated pole (ARCP) inverter is very similar to the parallel resonant converter. With proper normalization, the application of state plane analysis to the ARCP equivalent circuit is a geometric approach which provides much insight into the operating principle of the ARCP inverter. This elegant visualization simplifies the analysis and design of the ARCP inverter and can be extended to other ZVS inverters. A prototype ARCP inverter was constructed with load current adaptive control scheme, which utilizes the commutation characteristics of an inductive load to obtain soft switching performance with minimum hardware. Experimental waveforms are provided to show the soft switching performance of this ARCP inverter.